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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (95)
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Les sons
15 mai 2013, par -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...) -
MediaSPIP en mode privé (Intranet)
17 septembre 2013, parÀ partir de la version 0.3, un canal de MediaSPIP peut devenir privé, bloqué à toute personne non identifiée grâce au plugin "Intranet/extranet".
Le plugin Intranet/extranet, lorsqu’il est activé, permet de bloquer l’accès au canal à tout visiteur non identifié, l’empêchant d’accéder au contenu en le redirigeant systématiquement vers le formulaire d’identification.
Ce système peut être particulièrement utile pour certaines utilisations comme : Atelier de travail avec des enfants dont le contenu ne doit pas (...)
Sur d’autres sites (11784)
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How do I run the qt ffmpeg wrapper example ? (error : cannot find -lavutil)
29 août 2013, par JamesI am using QT 4.8 on the raspberry pi trying to save a binary stream to a video file like mp4. I was able to create and save static images by converting it into a QImage, but QT does not seem to support actually saving that stream (or the series of QImages) to a video file.
The only option I may have found is qt ffmpeg Wrapper
https://code.google.com/p/qtffmpegwrapper/but the example won't run out of the box. I am having the same exact problem as this guy :
All I did was download it and try to run the included example, but no go.
Am I supposed to download ffmpeg files prior to using this ? apt-get install ffmpeg ?Thanks !
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Concat video/audio files downloaded from mpd dash manifest
15 mai 2022, par Bloworlf MathurinI have this manifest I fetched from an url :


<?xml version="1.0"?>
<mpd type="dynamic" xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" availabilitystarttime="2022-05-14T21:18:50-07:00" availabilityendtime="2022-05-14T22:35:36-07:00" timeshiftbufferdepth="PT20S" suggestedpresentationdelay="PT2S" minbuffertime="PT1S" publishtime="2022-05-14T21:18:50-07:00" minimumupdateperiod="PT1S" validationerrors="" currentservertimems="0" firstavtimems="1652588331877" lastvideoframets="0" loapstreamid="17944405669984029" publishframetime="939">
 <period start="PT0S">
 <adaptationset segmentalignment="true" maxwidth="432" maxheight="766" maxframerate="30">
 <representation mimetype="video/mp4" codecs="avc1.4d401e" width="432" height="766" framerate="30" startwithsap="1" bandwidth="38894" maxbandwidth="46772" playbackresolutionmos="432:82.84,720:65.43,216:70.39" qualityclass="sd" qualitylabel="432p">
 <segmenttemplate presentationtimeoffset="0" timescale="1000" initialization="some/url/some_id-init.m4v?ms=m_C&amp;ccb=2-4" media="some/url/some_id-$Time$.m4v?ms=m_C&amp;ccb=2-4">
 <segmenttimeline>
 <s t="4092613" d="2000"></s>
 <s t="4094613" d="2000"></s>
 <s t="4096613" d="2000"></s>
 <s t="4098613" d="2000"></s>
 <s t="4100613" d="2000"></s>
 <s t="4102613" d="2000"></s>
 <s t="4104613" d="2000"></s>
 <s t="4106613" d="2000"></s>
 <s t="4108613" d="2000"></s>
 <s t="4110613" d="2000"></s>
 </segmenttimeline>
 </segmenttemplate>
 </representation>
 </adaptationset>
 <adaptationset segmentalignment="true">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" audiosamplingrate="44100" startwithsap="1" bandwidth="48979" maxbandwidth="57732">
 <segmenttemplate presentationtimeoffset="0" timescale="1000" initialization="some/url/some_id-init.m4a?ms=m_C&amp;ccb=2-4" media="some/url/some_id-$Time$.m4a?ms=m_C&amp;ccb=2-4">
 <segmenttimeline>
 <s t="4092613" d="2000"></s>
 <s t="4094613" d="2000"></s>
 <s t="4096613" d="2000"></s>
 <s t="4098613" d="2000"></s>
 <s t="4100613" d="2000"></s>
 <s t="4102613" d="2000"></s>
 <s t="4104613" d="2000"></s>
 <s t="4106613" d="2000"></s>
 <s t="4108613" d="2000"></s>
 <s t="4110613" d="2000"></s>
 </segmenttimeline>
 </segmenttemplate>
 </representation>
 </adaptationset>
 </period>
</mpd>


I manage to download all the files (init file + 10 segment files) and put them in an array


File[] files = downloadSegments();

So I have :
[0] -> file-0.m4v (which is the init file)
[1] -> file-1.m4v (1st segment)
... and so on.


My question is how can I concat/append all these files into another file (final_segment.m4v) ?


I looked around a lot and am now using 'com.arthenica:ffmpeg-kit-video:4.5.1-1'
I've last tried :


FFmpegSession session = FFmpegKit.execute("-i file-0.m4v -i file-1.m4v ... -c copy final_segment.m4v");


Is there something I'm missing ?


Also I assume that I'll have to do the same for the audio segments. So I will have 2 files (final_segment.m4v and final_segment.m4a) that I will have to merge/mix together.


If you could help me with some piece of code, that would be great.


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How to correctly use h264_amf on Windows ?
27 octobre 2022, par HarshivI'm trying to use hardware encoding with FFMPEG on Windows 10 with AMD Radeon r5 M330 DGPU on laptop : HP-AC026-TX. FFMPEG version is
5.1.2-full_build-www.gyan.devfrom gyan.dev. I'm using this :

fmpeg ^
 -hide_banner ^
 -v verbose ^
 -i "%1" ^
 -c:v h264_amf -acodec copy -y out.mp4


but it fails with :


[h264_amf @ 000001fb84d80b80] AMF initialisation succeeded via D3D11.
[h264_amf @ 000001fb847ab3c0] CreateComponent(AMFVideoEncoderVCE_AVC) failed with error 36
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height


The arguments seem as generic as I could hope, FFMPEG should use sensible defaults, so I can't Understand why it is failing.
Entire FFMPEG output is :


[h264 @ 000001fb84706c40] Reinit context to 1920x1088, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1366_pngl_20220816_161558.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 0
 compatible_brands: isommp42
 creation_time : 2022-08-16T10:51:42.000000Z
 com.android.version: 11
 com.android.capture.fps: 30.000000
 Duration: 00:03:41.33, start: 0.000000, bitrate: 7517 kb/s
 Stream #0:0[0x1](eng): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(tv, bt709, progressive, left), 1920x1080 (1920x1088), 7259 kb/s, SAR 1:1 DAR 16:9, 29.96 fps, 29.99 tbr, 90k tbn (default)
 Metadata:
 creation_time : 2022-08-16T10:51:42.000000Z
 handler_name : VideoHandle
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 256 kb/s (default)
 Metadata:
 creation_time : 2022-08-16T10:51:42.000000Z
 handler_name : SoundHandle
 vendor_id : [0][0][0][0]
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_amf))
 Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[h264 @ 000001fb84787400] Reinit context to 1920x1088, pix_fmt: yuv420p
[graph 0 input from stream 0:0 @ 000001fb84cfd780] w:1920 h:1080 pixfmt:yuv420p tb:1/90000 fr:90000/3001 sar:1/1
[h264_amf @ 000001fb84d80b80] AMF initialisation succeeded via D3D11.
[h264_amf @ 000001fb847ab3c0] CreateComponent(AMFVideoEncoderVCE_AVC) failed with error 36
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[AVIOContext @ 000001fb846f89c0] Statistics: 0 bytes written, 0 seeks, 0 writeouts
[AVIOContext @ 000001fb846f3f40] Statistics: 371902 bytes read, 3 seeks
Conversion failed!


What should I do to make hardware encoding work ?


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